Waveguide, Wave Beam Adjusting Device, Wave Beam Adjusting Method and Manufacturing Method

A waveguide, comprising:

• a metallic housing having a shape of a cuboid and an opening disposed in a side of the metallic housing, the opening having an area smaller than that of the side;
• a slow-wave medium having a refractive index that is greater than 1, accommodated in the metallic housing and having the shape of a cuboid, wherein each internal surface of the metallic housing is in contact with a corresponding surface of the slow-wave medium;
• two feeding probes respectively located at both ends of the metallic housing with each inserted into the slow-wave medium through the metallic housing;
• a slit plate covering the opening of the metallic housing and adhering to the slow-wave medium, and disposed to form a metallic layer comprising a plurality of slits at a side of the slow-wave medium;
• a plurality of diodes disposed on the slit plate and corresponding to the plurality of slits in a one-to-one relationship, each of the plurality of diodes crosses the corresponding slit, and a cathode of each of the plurality of diodes is electrically connected with the metallic housing;
• and
• a plurality of photodetectors disposed on the slit plate and corresponding to the plurality of diodes in a one-to-one relationship, wherein each of the plurality of photodetectors is electrically connected with an anode of the corresponding diode.